US11284704B2 - Push broom head and method of fabrication thereof - Google Patents
Push broom head and method of fabrication thereof Download PDFInfo
- Publication number
- US11284704B2 US11284704B2 US16/834,962 US202016834962A US11284704B2 US 11284704 B2 US11284704 B2 US 11284704B2 US 202016834962 A US202016834962 A US 202016834962A US 11284704 B2 US11284704 B2 US 11284704B2
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- United States
- Prior art keywords
- bristles
- rows
- leading
- trailing
- base
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Classifications
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D1/00—Bristles; Selection of materials for bristles
- A46D1/02—Bristles details
- A46D1/0207—Bristles characterised by the choice of material, e.g. metal
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B9/00—Arrangements of the bristles in the brush body
- A46B9/06—Arrangement of mixed bristles or tufts of bristles, e.g. wire, fibre, rubber
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B9/00—Arrangements of the bristles in the brush body
- A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
- A46B9/025—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups the bristles or the tufts being arranged in an angled position relative to each other
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D1/00—Bristles; Selection of materials for bristles
- A46D1/08—Preparing uniform tufts of bristles
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D3/00—Preparing, i.e. Manufacturing brush bodies
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/30—Brushes for cleaning or polishing
- A46B2200/302—Broom
Definitions
- the present invention relates to push brooms. More precisely, the present invention relates to a push broom head and a method of fabrication thereof.
- Different types of push brooms typically apply to different types of anticipated particles to be swept and to different types of sweeping surfaces, based on the fact that different type of bristles removing different types of particles depending on the sweeping surface.
- Some broom heads combine bristles of different stiffness so as to efficiently remove a range of particles in one operation with a single broom. It has been found that coarse forward bristles are efficient in sweeping heavy particles while rear less coarse bristles take up finer materials that are not picked up by the coarser front bristles.
- a number of configurations for broom heads were presented, including for example finer-bristled, softer border with a coarse, stiffer center section; or coarser front bristles and longer, finer rear bristles.
- a push broom head comprising a base, the base comprising a leading edge and a trailing edge separated by a width of the base; and tufts of bristles of a same free length extending from a surface of the base; wherein the tufts of bristles are arranged in rows of bristles of decreasing stiffness from the leading edge to the trailing edge of the base.
- a method for making a push broom head comprising providing a base having a leading edge and a trailing edge; and securing rows of bristles of decreasing stiffness from the leading edge to the trailing edge of the base.
- FIG. 1 is a side view of a broom head at rest according to an embodiment of an aspect of the present disclosure
- FIG. 2 is a side view of a broom head at rest according to an embodiment of an aspect of the present disclosure in use;
- FIG. 3 is a bottom view of a broom head base according to an embodiment of an aspect of the disclosure
- FIG. 4 shows a test to assess stiffness of bristles
- FIG. 5 shows a test to assess stiffness of bristles.
- a broom head 10 as illustrated for example in FIGS. 1 and 2 comprises a base 12 having an upper surface 16 and a lower surface 14 , the lower surface 14 facing a surface to be swept in normal use.
- the base 12 has a central vertical axis (V), and may be connected at a distal end of a handle (H) (not shown in FIG. 1 ) for use by an operator.
- the base 12 has a leading edge 18 and a trailing edge 20 separated by a width W.
- the base 12 supports bristles or tufts of bristles extending from the surface facing a surface to be swept in normal us, i.e. the lower surface 14 in the present example.
- tufts of bristles are arranged in rows generally parallel to the leading edge 18 and the trailing edge 20 of the base 12 .
- tufts 30 a - 30 f are made of bristles of a same free length (I) from the lower surface 14 of the base 12 to their free end.
- the bristles may be in PE, PET, PP or PVC for example.
- the central lines of the rows are extrapolated by dashed lines in FIG. 1 outwardly from their respective bristle free ends to show rest angles ⁇ a- ⁇ f relative to the central vertical axis (V) of the base 12 .
- the rest angles indicate the inclination of the tufts from the central vertical axis (V) when no pressure is applied thereto, i.e. typically when the broom head is at rest and not being used against a surface to be swept.
- Leading rows referring to rows positioned closest to the leading edge 18 of the base 12 , for example within the first third of the width W of the base 12 from the leading edge 18 , comprise rows of tufts 30 a and 30 b of very stiff bristles.
- PVC bristles of a diameter 0.060′′ for a length of 2.9′, with rest angles ⁇ a of about 9°, and ⁇ b of about 6° respectively are selected.
- At least two leading rows a and b of very stiff tufts are used, and they are offset along the length L of the base 12 (see ⁇ in FIG.
- Middle rows immediately downstream of the leading rows from the leading edge of the base i.e. for example within the middle third of the width W of the base 12 , comprise tufts 30 c and 30 d of bristles having a smaller stiffness that the leading rows, such as for example PET bristles of a diameter of about 0.029′′ for the same length (I) of 2.9′, with rest angles ⁇ c of about 1°, and ⁇ d of about 1° respectively.
- a trailing row i. e closest the trailing edge 20 of the base 12 , comprise tufts of bristles 30 f having a still smaller stiffness, for example PET bristles of a diameter of about 0.018′′ for a length of 2.9′, with a rest angle ⁇ f of about ⁇ 9°.
- the bristles of the tufts 30 d may be flagged, for increased picking up efficiency of finer particles such as dust fine.
- Additional tufts 30 e may be provided between the middle rows and the trailing row, for picking up finer particles such as dust or sand.
- the additional tufts of bristles 30 e may have a stiffness smaller than the tufts of bristles of the trailing row, for example PET bristles of a diameter of about 0.014′′ for a length (l) of 2.9°, with rest angle ⁇ e of about ⁇ 6°. At a constant diameter and free length and type of material, these bristles of tufts 30 e may be crimped.
- Stiffness also referred herein as rigidity, may be characterized by the deformation of bristles when submitted to a force, as shown in FIGS. 4 and 5 for example, and Table II below:
- the ratio of the rigidity of the bristles of the middle rows (c, d) over the rigidity of the bristles of the trailing row (f) of 0.25/0.0355 7, meaning that the rigidity of the bristles of the middle rows (c, d) is 7 times larger than the rigidity of the bristles of the trailing row (f).
- a ratio of the rigidity of the bristles of the leading rows over the rigidity of the bristles of the trailing row is selected in a range between about 10 and about 20.
- the ratio of the rigidity of the bristles of the leading rows over the rigidity of the bristles of the middle rows may be selected in a range between about 1.5 and about 20, for example of about 2 in the example above.
- the ratio of the rigidity of the bristles of the middle rows over the rigidity of the bristles of the trailing row may be selected between about 1.5 and about 20, for example of about 7.0.
- the present push broom head thus comprises very stiff bristles on the leading edge thereof, amounting for about 1 ⁇ 3 of the number of tufts of the broom head, and much less stiff or unbending under a same load, bristles downstream of the leading rows from the leading edge, especially bendable tufts of bristles in the trailing row.
- the bristles may be in a same material, and of a same free length from the surface of the broom head.
- the rest angle of the very stiff bristles on the leading edge may be selected of most 10° and the rest angle d for the trailing rows may be selected of at most ⁇ 10°.
- the very stiff bristles at the leading edge of the broom head resist folding backwards from the leading edge upon contacting the surface being swept (G) and when the friction surface between the surface being swept (G) and the bristles increases, as schematically shown in FIG. 2 .
- the bristles at the trailing edge although more bendable and typically finer, i.e. of a reduced diameter, are protected against premature or excessive wear as the leading edge of the broom head, i.e. the stiff leading rows, supports the pressure.
- the present broom head is thus efficient both on a range of particles sizes, from heavier to finer particles, and on a range of surfaces, from smooth to very rough, while preventing premature or excessive wear of any of the leading or trailing bristles.
Abstract
Description
TABLE I | ||||
Inclination θ | ||||
relative to the base | ||||
PET bristles | length | Ø | stiffness | of the brush head |
First and second | 2.9″ | .060″ | ++ | 9°, 6°, |
leading rows a-b | ||||
Middle rows c-d | 2.9″ | .029″ | − | 1°, 1° |
row e | 2.9″ | .014″ (crimped) | − | −6° |
Trailing row f | 2.9″ | .018″ (flagged) | − | −9°; |
TABLE I | |||||
Applied | Deformation D | Deformation | |||
rows | force (N) | (po) | D/applied Force | ||
a and b | 0.1161504 | 0.016 | 0.137752431 | ||
c and d | 0.1161504 | 0.0355 | 0.305638207 | ||
e | 0.0244269 | 0.1185 | 4.851209118 | ||
f | 0.1161504 | 0.25 | 2.15238174 | ||
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/834,962 US11284704B2 (en) | 2019-04-04 | 2020-03-30 | Push broom head and method of fabrication thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962829248P | 2019-04-04 | 2019-04-04 | |
US16/834,962 US11284704B2 (en) | 2019-04-04 | 2020-03-30 | Push broom head and method of fabrication thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
US20200315335A1 US20200315335A1 (en) | 2020-10-08 |
US11284704B2 true US11284704B2 (en) | 2022-03-29 |
Family
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Application Number | Title | Priority Date | Filing Date |
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US16/834,962 Active 2040-07-16 US11284704B2 (en) | 2019-04-04 | 2020-03-30 | Push broom head and method of fabrication thereof |
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US (1) | US11284704B2 (en) |
CA (1) | CA3077856A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230093907A1 (en) * | 2021-09-30 | 2023-03-30 | John J. Buettgen | Crematory Brush |
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- 2020-04-03 CA CA3077856A patent/CA3077856A1/en active Pending
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